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Why barrels will not last... |
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8shots
Optics Jedi Knight Lord Of The Flies Joined: March/14/2007 Location: South Africa Status: Offline Points: 6253 |
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Posted: July/18/2013 at 08:05 |
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Did you ever ponder over these facts: (and please let the maths gurus check my facts)
Assumptions:
Bullet lenth= 1inch.
Bullet speed = 3000ft per second
Number of rounds fired = 3000
Powder charge = 50gr
Barrel life = 3000 rounds
Now the amazing stuff:
3000 bullets have a total length of 250 ft.
At 3000ft per second the 250 ft get pushed through the barrel in .08 of a second!!
A total of 21 pounds of powder is burnt in .08 of a second.
And we want barrels to last !!
The total life of a barrel is thus .08 of a second!!!
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3_tens
Optics Jedi Master Joined: January/08/2007 Location: Oklahoma Status: Offline Points: 7853 |
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South of the equator. Winter, even so it, is a little early for cabin fever to be setting in.
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Folks ain't got a sense of humor no more. They don't laugh they just get sore.
Need to follow the rules. Just hard to determine which set of rules to follow Now the rules have changed again. |
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koshkin
MODERATOR Dark Lord of Optics Joined: June/15/2004 Location: United States Status: Offline Points: 13182 |
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Neither the math nor the physics is correct, but it is a nice sentiment.
Technically, the bullet accelerates from standstill to 3000fps while it is in the barrel. It does not traverse the whole barrel length at 3000fps. Also, since the force on the bullet due to expanding gases is not constant, the acceleration is not constant either. If you assume that the acceleration is constant and a typical barrel is 24 inches (2 feet), and accept the rest of your assumptions, the bullet spends 1.33msec in side a barrel. If the barrel life is 3000 rounds, it has been subjected to the trauma of a bullet travelling through it for approximately four seconds. Now, with all that out of the way, the bullet itself does almost nothing to damage the barrel. The damage comes from hot gases and powder residue, not from the bullet itself. Oh, and yes, cabin fever sets in all over the world, Lile... don't ask me how I know. ILya
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3_tens
Optics Jedi Master Joined: January/08/2007 Location: Oklahoma Status: Offline Points: 7853 |
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http://www.squidoo.com/cabin-fever-illness
Cabin Fever can be found anywhere is related to isolation and confined spaces, Darker shorter daylight of winter leads to increased occurrences. The original implication was that some people have too much time on there hands. Leading to nit picking trivial matters. It is present everywhere, Your point was proven. |
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Folks ain't got a sense of humor no more. They don't laugh they just get sore.
Need to follow the rules. Just hard to determine which set of rules to follow Now the rules have changed again. |
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Son of Ed
Chuck Norris Joined: June/18/2011 Location: TEXAS Status: Offline Points: 122210 |
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" Hot gases, huh? " |
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Visit the Ed Show
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8shots
Optics Jedi Knight Lord Of The Flies Joined: March/14/2007 Location: South Africa Status: Offline Points: 6253 |
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Kickboxer
MODERATOR Moderator Joined: February/13/2008 Status: Offline Points: 23679 |
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THAT is a horrible thought...
You have a way of bending minds, 8's... "oh, the humanity"...
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Opinion,untempered by fact,is ignorance.
There are some who do not fear death... for they are more afraid of not really living |
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Alan Robertson
Optics Master Joined: October/31/2009 Location: Oklahoma Status: Offline Points: 1763 |
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Barrel Steel and minds
expand and contract. Chip away, chip away until nothing is left. Primal need applies the pressure Menus change, but who's the cook? |
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"Garg'n uair dhuisgear"
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RifleDude
MODERATOR EVIL OPPRESSOR Joined: October/13/2006 Location: Texas Status: Offline Points: 16337 |
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Wow... that was poignant, inspiring, and creepy all at the same time, Alan!
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Ted
Money can't buy happiness... but it's much more comfortable to cry in a Porsche than on a bicycle. |
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Alan Robertson
Optics Master Joined: October/31/2009 Location: Oklahoma Status: Offline Points: 1763 |
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The "angel" is Yolandi Visser. She's probably known to Wooter as she is a South African singer/entertainer in a group called Die Antwoord.
She's either brilliant or just a nasty little thing... |
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"Garg'n uair dhuisgear"
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dsr
Optics Apprentice Joined: May/31/2007 Location: United States Status: Offline Points: 244 |
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Still a neat way of looking at barrel life. Four seconds of high temperature gas cutting life.
As for the chick I'm going towards the nasty little thing. Try zooming in on her left eye in the second picture. |
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Peddler
Optics God Joined: July/04/2012 Location: Oswego,NY Status: Offline Points: 13526 |
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Definitely road hard and put away wet. Bad helmet !!!
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When you are dead, you don't know you are dead.It is difficult only for others.
It is the same when you are stupid. |
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BeltFed
Optics Retard Joined: February/12/2008 Location: Ky Status: Offline Points: 22287 |
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If all this is true, then can someone explain how machinegun barrels can last many thousand of rounds? In WWI the water cooled machine guns on both sides would fire over 100,000 rounds in a day, and still be serviceable for the next day's fighting. In WWII air cooled barrels were heavier to absorb and disapate more heat, and had to be fired in shorter burst, but still lasted almost as long. Even quick change barrels lasted a long time, if changed at the appropriate time.
Granted, we're not talking about the same level of accuracy, but what falls into servicability for us.
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Life's concerns should be about the 120lb pack your trying to get to the top of the mountain, and not the rock in your boot.
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8shots
Optics Jedi Knight Lord Of The Flies Joined: March/14/2007 Location: South Africa Status: Offline Points: 6253 |
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I cannot explain how they last, exept that I can also relate to that. We fired machine gun and FN 308 barrels red hot and they were still good for a few thousand rounds. Or so we thought. We never did shoot 5 shot groups with a 20mm Browning. But we did spray them wildly in the right direction !!! Who cared about accuracy, as long as their was lead in the air...
On the other hand calibers loaded hot, or small bore to load ratios, definately do not last beyond 3000 rounds and still give a decent level of accuracy.
My last barrel threw flyers that would not hit a 12 inch target at 200 yds. The throat was toasted.
Most hunters do not fire enough rounds in a lifetime to test their rifles barrel life, so they do not give it a second thought. Say 50 rounds a year for 30 years = 1500 rounds. On hunting loads and calibers this is nothing. But talk to the competition guys who go through a 1000 rounds + a year, then the 4 secs of flame torch stuff starts to count.
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sakomato
Optics Master Joined: February/28/2008 Location: Houston Status: Offline Points: 1166 |
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Secret to long barrel life? Stay away from:
1. Overheating barrel by continuous firing 2. Overbore calibers that use large amounts of slow burning powder trying to exit down a small caliber hole |
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Guns only have 2 enemies, rust and politicians
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B W M
Optics GrassHopper Joined: October/25/2010 Location: Princeton IN. Status: Offline Points: 19 |
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What if you use moly bullets and cote the barrel with moly?
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X navy love long & short big & little Guns
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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Like everything else gun related you get different opinions from the experts. Here is an article by david tubb about moly bullets. http://riflemansjournal.blogspot.com/2009/09/moly-coating-david-tubb.html THis is from Lilja rifle barrels
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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.
"A Liberal is a person who will give away everything they don't own." |
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Kickboxer
MODERATOR Moderator Joined: February/13/2008 Status: Offline Points: 23679 |
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The real benefit to using moly is for those who sell it... profits...
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Opinion,untempered by fact,is ignorance.
There are some who do not fear death... for they are more afraid of not really living |
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helo18
Optics Jedi Knight Joined: December/02/2006 Location: Montana Status: Offline Points: 5620 |
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I think I may have one AR now that has about 16 seconds of use so far. I might be a touch behind the curve with it.
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To be prepared for War is one of the most effectual means of preserving peace.
GEORGE WASHINGTON |
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billyburl2
Optics Master Extraordinaire Joined: January/08/2009 Location: Cottonwood, AZ Status: Offline Points: 4015 |
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Hmmm, this is interesting. Most of the tac-precision crowd has gone to light recoiling, but way over-bore rifles such as the 243 Win. Most complain about barrel life, but many are saying that barrel life can be EXTENDED by using a slower burning powder. They explain by stating, a slower burning powder will burn all the way down the barrel, not just in the throat.
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If it is tourist season, why can't we shoot them?
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